package com.seig.canteensystem.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.seig.canteensystem.common.BaseContext;
import com.seig.canteensystem.common.R;
import com.seig.canteensystem.entity.ShoppingCart;
import com.seig.canteensystem.service.ShopingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShopingCartService shopingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,currentId);

        Long dishId = shoppingCart.getDishId();
        if(dishId!=null){
            //添加到购物车的是菜品
            lambdaQueryWrapper.eq(ShoppingCart::getDishId,dishId);

        }else{
            //添加到购物车的是套餐
            lambdaQueryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());

        }

        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shopingCartService.getOne(lambdaQueryWrapper);

        if (cartServiceOne !=null) {
            //如果已经存在，直接在原来数量上+1
            cartServiceOne.setNumber(cartServiceOne.getNumber()+1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shopingCartService.updateById(cartServiceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认为1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shopingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }

        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车");

        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        lambdaQueryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> shoppingCartList = shopingCartService.list(lambdaQueryWrapper);
        return R.success(shoppingCartList);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        //SQL:delete from shopping_cart where user_id = ?
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        shopingCartService.remove(lambdaQueryWrapper);

        return R.success("清空成功");

    }

}
